Compared to regular motor vehicles, tuned and modified cars are known for its increased velocity and high cornering speed. Because of this, the engine and transmission take far more abuse than the norm.

By using regular or worn down mounts may result in the following.

Excessive Engine Vibration
Plumbing Problems Caused By This Excessive Vibration
Steering Wheel Oscillation Caused By Engine Vibration
Hindered Stability when Turning
Gear Disengagement Due to Transmission Vibration
Shifting Difficulties Due to Transmission Vibration
Chassis becomes fatigued due to Vibration Absorbtion

Therefore, it is recommended that the engine & transmission mounts be swapped out.

NISMO ENGINE & TRANSMISSION MOUNT BENEFITS
These units are a direct swap, sustaining an identical shape of a stock unit. The rubber material has been made with stronger composites, so they are more than ready to be used for aggressive driving activities such as drifting and circuit driving. The transmission mounts enable and improve a smooth gear engagement, increasing the driving sensation to another level. Plus, Nismo is an entity of the Nissan Motor Company, so the price is set at a reasonable rate.

Applications:

Skyline RB20DT RB25DET
RSS R34 2WD
Silvia 180SX CA20DE CA20DET
PS13 RPS13 S14 S15